Function linearFormula

linearFormula(a: number, b: number, c?: number, d?: number): number
Solves a linear equation.
Parameters
- a: number
  The slope (in slope-intercept form)
- b: number
  The y-intercept (in slope-intercept form)
- Optionalc: number
  The y-intercept (in standard form)
- Optionald: number
  The y-coordinate of the second point (in point-slope form)
Returns number
Example
```
const result = Chalkboard.real.linearFormula(1, 3, 2, 5); // Returns 2
```
- Defined in Chalkboard.real.ts:406